How to add custom help while keeping default verb help

I try to always add a line like:

`"Usage: clitool.exe [command] [options]" `when command is called with --help or without.

I could add it like: `AddPreOptionsLine("Usage: clitool.exe [command] [options]"); `but then the help for each verb was gone.

Start by reproducing the reported behavior with AddPreOptionsLine("Usage: clitool.exe [command] [options]") when invoking --help and when no command is supplied. Review the help-customization entry points and examples to determine whether the default verb help can be retained; done means the custom usage line appears without removing each verb's help.

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